How can I calm my boyfriend down when he's sad?

Me and my boyfriend were dancing they played a sad song he didn't like it. It was a country song I don't know who it was I don't really listen to country anymore. He loves it but he hated the song. He put his arms around me and cried his eyes out. I tried hugging him and kissing and talking to him but it didn't work. How can I calm him down? What else should I say to him?